Encapsulate CSS selector declarative content condition tracking

extensions/browser/api/declarative_content/content_rules_registry.h

Index: extensions/browser/api/declarative_content/content_rules_registry.h
diff --git a/extensions/browser/api/declarative_content/content_rules_registry.h b/extensions/browser/api/declarative_content/content_rules_registry.h
index f7f08bdb079a0ab36b3694c7ede75938861a130c..25c3ee6e42e3784959a0d079c5d22340d26029ba 100644
--- a/extensions/browser/api/declarative_content/content_rules_registry.h
+++ b/extensions/browser/api/declarative_content/content_rules_registry.h
@@ -36,12 +36,6 @@ class ContentRulesRegistry : public RulesRegistry {
                       cache_delegate,
                       rules_registry_id) {}
 
-  // Applies all content rules given an update (CSS match change or
-  // page navigation, for now) from the renderer.
-  virtual void Apply(
-      content::WebContents* contents,
-      const std::vector<std::string>& matching_css_selectors) = 0;
-
   // Applies all content rules given that a tab was just navigated.
   virtual void DidNavigateMainFrame(
       content::WebContents* tab,